You've certainly got lots of ideas!

Orange is always a sweet colour, and looks great on an s2000.
I can see you've tried very hard to make this look awesome, however there are mistakes:
->The paint looks a little flat and toony - compare it to the base, it lacks the highlights and shadows that it has. Perhaps try just brushing small areas for now

->The kit is very square and angular, I'm not sure this works so well with the shapes of the s2000
->Carbon pattern is much too big
However...
->The rims fit very well

Perhaps lower the car a bit more?
->Backdrop fits well too, just the shadow is a little bit off - use the base image to get the right shape shadow
So overall there is good and bad. Maybe try and simplify what you are doing, go for quality of mods, not quality, then you will start to see an improvement.
Keep it up
